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How to initialize const variables of any class in C++

#include <iostream>
using namespace std;

class circle{

double r;
const double pi;

circle(double r) : pi(3.14159){
double area (){
	return pi*(pow(r,2));
double circumference (){
	return 2*pi*r;

int main(){
	circle c=circle(6.70);
	cout<<"area of circle :"<<c.area()<<endl;
	cout<<"circumference of circle :"<<c.circumference ()<<endl;
	return 0;